Select all rows from the 'users' table where the 'username' column, when converted to lowercase, equals 'admin'.
CREATE TABLE users (username VARCHAR, email VARCHAR); INSERT INTO users (username, email) VALUES ('Admin', 'admin@example.com'), ('user', 'user@example.com');
```sql
SELECT * FROM users WHERE LOWER(username) = 'admin';
```
```sql
SELECT * FROM users WHERE LOWER(username) = 'admin';
```